Scr. RiiODOSPRiiMRTK. Yam. Jlhodomelacem. 



Plate CXXXII. 



ACANTHOPHORA AUBOREA, Harv. 



Gen. Char. Frond filiform, cartilaginous, irregularly decompound, opaque, 

 coated with small, polygonal, irregularly placed cellules ; axis articu- 

 lated, polysiplionous. Hamuli short, spine-like, acute, inserted on all 

 sides. Fructification : 1, urceolate ceramidia, containing within a cel- 

 lular pericarp a tuft of pear-shaped spores ; 2, tripartite tetraspores, 

 lodged in globose, sessile sticJddia. — Acanthophora [Lamour.), from 

 UKavOa, a thorti, and (^opeoa, to hear ; alluding to the spine-like 

 ramuli. 



FronsfiUforniis, cartilaginea, vage ramosa, opaca, cellulis minutis polygonis irre- 

 gularibu-s corticata ; axi polysiphonio. Ramuli spinaformes, acuti, undiqtie 

 inserta. Frud. : 1, ceramidia; 2, sticJiidia globosa, sessilia, tetrasporas tri- 

 angule partitas foventia. 



AcANTHOPHOiiA arhorea ; frond tree-like, robust, decompoundly much 

 branched ; primary branches long, tapering upwards, laterally much 

 branched ; secondary branches short, dichotomo-multifid, the ramuli 

 very short, spinulous ; spines subulate, fasciculate, inserted on all 

 sides and imbricating ; ceramidia subterminal, pedunculate, ovate. 



A. arborea ; fronde dendroidea incrassata decomposite ramosissima ; ramis pri- 

 viai'iis elongatis versus apicem attenuatis lateraliter ramosissimis, ramis secun- 

 dariis brevibus dichotomo-muUifidis, ramulis brevissimis spinulosis, spinulis 

 subidatis fasciciilaiis undiqiie insertis imbricatis ; ceramidiis subterniinalibus 

 pedunculatis ovatis. 



AcANTHOPHORA arborea, Harv. in Fl. Tasm. v. 2. p. 296. 



AcANTHOPHORA TasmanicB, Harv. Alg. Exsic. Austr. n. 140, non Sond. 

 Hab. Eocks at low-water mark. In the Tamar, above Georgetown, on the 



shore under Mr. Lawrence's domain. Rev. J. Fereday and W. R. H. 

 Geogr. Distr. Tasmania. 



Descr. Root discoid. Fronds 12-30 inches long, dendroid, excessively branched, 

 the main stem cartilagineo-coriaceous, percurrent, nearly a Hue in diameter 

 below, attenuated upwards. Branches 3-6 inches long, spreading to all 

 sides, bushy, several times decompound, all the divisions alternate, erecto- 

 patent, and inserted on all sides in an irregularly spiral order : the smaller 

 divisions scarcely thicker than hog's-bristle. The spine-like ramuli are very 

 minute and closely set, with 2-3 incurved, subfalcate teeth at the extremity. 

 Ceramidia ovate, on long peduncles, or terminating short branchlets, densely 

 cellular. The frond is perfectly opaque in all parts, and coated with small 



